Analyzer and analyzing method

ABSTRACT

The present invention is to present an analyzing method for analyzing a target substance contained in a sample using a reagent containing magnetic particles. The method comprises steps of: (a) magnetically capturing magnetic particles in a container with a first magnetic force generating member arranged on a lower side of the container accommodating a liquid specimen containing the magnetic particles; (b) transferring the container to a target substance separating section after the step (a); and (c) in the target substance separating section, discharging a cleaning liquid into the container and aspirating a liquid in the container while magnetically capturing the magnetic particles in the container with a second magnetic force generating member.

RELATED APPLICATIONS

This application claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2010-278439 filed on Dec. 14, 2010, the entire content of which is hereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to analyzers and analyzing methods, and in particular, to an analyzer and an analyzing method for analyzing a target substance contained in a sample using a reagent containing magnetic particles.

2. Field of the Invention

An analyzer for analyzing a target substance contained in a sample using a reagent containing magnetic particles is conventionally known (see e.g., Japanese Laid-Open Patent Publication No. 2001-91521). In such an analyzer, the BF (Bound-Free) separation process of separating an immune complex containing the target substance from a unreacted substance is carried out. In the BF separation process, the immune complex, in which the analyzing target (antigen or antibody) in the sample and the magnetic particles bound with a reacting substance that uniquely binds with the analyzing target are reacted, is captured at an inner wall of a reaction container by magnetic force, and the supply of cleaning liquid to the reaction container and the aspiration of liquid in the reaction container are carried out so that the unreacted substance in the reaction container is removed leaving the immune complex captured at the inner wall of the reaction container.

Japanese Laid-Open Patent Publication No. 2001-91521 discloses an analyzer including a transporting body for transporting a reaction container, three cleaning ports arranged along the transporting direction of the reaction container by the transporting body, and a BF nozzle, arranged for each of the three cleaning ports, for aspirating impurities and discharging cleaning liquid. In such an analyzer, three magnets are arranged in correspondence with each cleaning port at the side of the container with respect to the advancing direction of the reaction container by the transporting body. Each magnet is arranged to extend across the corresponding cleaning port and the previous port. In such an analyzer, the magnetic particles in the reaction container are captured at the inner wall (inner side surface) of the container by the magnetic force at the previous port, and thereafter, the reaction container is transported up to the corresponding cleaning port with the magnetic force continuously applied, and the BF separation process is carried out.

However, in the analyzer described in Japanese Laid-Open Patent Publication No. 2001-91521, a configuration of continuously applying magnetic force while the reaction container is transported from the previous port to the corresponding cleaning port needs to be adopted to prevent the magnetic particles captured at the inner side surface of the container in advance from diffusing again. Accordingly, the degree of freedom in the device configuration for carrying out the BF separation process narrows.

SUMMARY OF THE INVENTION

The scope of the present invention is defined solely by the appended claims, and is not affected to any degree by the statements within this summary.

A first aspect of the present invention is an analyzer for analyzing a target substance contained in a sample using a reagent containing magnetic particles, the analyzer comprising: a magnetic capturing section that comprises a first holder configured to hold a container accommodating a liquid specimen containing a sample and the reagent containing the magnetic particles and that comprises a first magnetic force generating member configured to magnetically capture the magnetic particles in the container held by the first holder; a target substance separating section that comprises a second holder configured to hold the container and a second magnetic force generating member configured to magnetically capture the magnetic particles in the container held by the second holder, and that discharges a cleaning liquid into the container held by the second holder and aspirates a liquid in the container held by the second holder while magnetically capturing the magnetic particles in the container with the second magnetic force generating member; and a container transferring section configured to transfer the container from the magnetic capturing section to the target substance separating section, wherein the first magnetic force generating member of the magnetic capturing section is arranged on a lower side of the container held by the first holder and is configured to magnetically capture the magnetic particles in the container held by the first holder.

A second aspect of the present invention is an analyzer for analyzing a target substance contained in a sample using a reagent containing magnetic particles, the analyzer comprising: a first holder configured to hold a container accommodating a liquid specimen including a sample and a reagent container magnetic particles; a first magnetic force generating member that is arranged on a lower side of the container held in the first holder, and that magnetically captures the magnetic particles in the container held by the first holder; a second holder configured to hold the container; a container transferring section configured to transfer the container from the first holder to the second holder; a second magnetic force generating member configured to magnetically capture the magnetic particles in the container held by the second holder; and a cleaning mechanism configured to discharge a cleaning liquid into the container held by the second holder and to aspirate a liquid in the container held by the second holder while the magnetic particles in the container held by the second holder are magnetically captured by the second magnetic force generating member.

A third aspect of the present invention is an analyzing method for analyzing a target substance contained in a sample using a reagent containing magnetic particles, the method comprising steps of: (a) magnetically capturing magnetic particles in a container with a first magnetic force generating member arranged on a lower side of the container accommodating a liquid specimen containing the magnetic particles; (b) transferring the container to a target substance separating section after the step (a); and (c) in the target substance separating section, discharging a cleaning liquid into the container and aspirating a liquid in the container while magnetically capturing the magnetic particles in the container with a second magnetic force generating member.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing an overall configuration of an immune analyzer according to one embodiment of the present invention;

FIG. 2 is a plan view showing an overall configuration of the immune analyzer according to one embodiment of the present invention;

FIG. 3 is a block diagram for describing the configuration of the immune analyzer according to one embodiment of the present invention;

FIG. 4 is a perspective view for describing a configuration of a primary BF separator of the immune analyzer according to one embodiment of the present invention;

FIG. 5 is a plan view of the primary BF separator shown in FIG. 4;

FIG. 6 is a schematic view showing a pre-magnetism collecting part and BF ports of the primary BF separator shown in FIG. 4 from a front surface side;

FIG. 7 is a perspective view for describing the pre-magnetism collecting part and the BF ports of the primary BF separator shown in FIG. 4;

FIG. 8 is a cross-sectional view schematically showing an internal structure of the pre-magnetism collecting part of the primary BF separator shown in FIG. 4;

FIG. 9 is a schematic view for describing the functions of the pre-magnetism collecting part and the BF ports of the primary BF separator shown in FIG. 4;

FIG. 10 is a timing chart for describing the BF separation process by the primary BF separator of the immune analyzer according to one embodiment of the present invention;

FIG. 11 is a timing chart for describing the BF cleaning process (aspirating/discharging process) in the BF separation process shown in FIG. 10;

FIG. 12 is a timing chart for describing a BF cleaning process (aspirating process) in the BF separation process shown in FIG. 10;

FIG. 13 is a flowchart showing a control operation of the transfer process to the pre-magnetism collecting part in the primary BF separator of the immune analyzer according to one embodiment of the present invention;

FIG. 14 is a flowchart showing a control operation of the transfer process to the BF port in the primary BF separator of the immune analyzer according to one embodiment of the present invention;

FIG. 15 is a flowchart showing a control operation of the BF cleaning process performed in each BF port of the primary BF separator of the immune analyzer according to one embodiment of the present invention; and

FIG. 16 is a flowchart showing a control operation of the transfer process to the reaction unit in the primary BF separator of the immune analyzer according to one embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Hereinafter embodiments embodying the present invention will be described based on the drawings.

First, the configuration of an immune analyzer 1 according to one embodiment of the present invention will be described with reference to FIGS. 1 to 9.

The immune analyzer 1 according to one embodiment of the present invention is an apparatus for quantitatively measuring or qualitatively measuring antigens and antibodies contained in a sample (blood specimen) such as blood to be measured. The immune analyzer 1 is configured to bind magnetic particles (R2 reagent) to a capture antibody (R1 reagent) bound to an antigen contained in a sample (blood serum), and thereafter, capture a complex of the bound antigen, capture antibody, and magnetic particles by magnetism of a primary BF separator 11 to remove (BF separation) the R1 reagent containing unreacted (free) capture antibody. The immune analyzer 1 binds the antigen bound with the magnetic particles and a labeled antibody (R3 reagent), and thereafter, captures a complex of the bound magnetic particles, antigen, and labeled antibody by magnetism of a secondary BF separator 12 to remove (BF separation) the R3 reagent containing unreacted (free) labeled antibody. The immune analyzer 1 also adds a dispersion liquid (R4 reagent) and a light emitting substrate (R5 reagent) that emits light in the reaction process with the labeled antibody, and then measures the light emitting amount generated by the reaction of the labeled antibody and the light emitting substrate. The immune analyzer 1 quantitatively measures the antigen contained in the sample that binds with the labeled antibody through such steps. The immune analyzer 1 is configured to be able to perform analysis corresponding to a plurality of different analyzing items with respect to the sample.

As shown in FIG. 1 and FIG. 2, the immune analyzer 1 includes a measurement mechanism section 2, a sample transporting section (sampler) 3 arranged to be adjacent to the measurement mechanism section 2, and a control device 4 including a PC (personal computer) electrically connected to the measurement mechanism section 2.

The sample transporting section 3 is configured to transport a rack mounted with a plurality of test tubes accommodating the sample. The sample transporting section 3 has a function of transporting the test tube accommodating the sample to a sample aspirating position 220 by a dispensing arm 5.

As shown in FIG. 3, the control device 4 includes a CPU 4 a, a display unit 4 b, an input unit 4 c, and a storage unit 4 d. The CPU 4 a has a function of analyzing the measurement result obtained by the measurement mechanism section 2, and displaying the analysis result on the display unit 4 b. The storage unit 4 d includes an HDD (Hard Disc Drive), and is configured to store various types of programs and data of measurement results, and the like.

As shown in FIG. 2, the measurement mechanism section 2 is configured by the sample dispensing arm 5, an R1 reagent dispensing arm 6, a R2 reagent dispensing arm 7, a R3 reagent dispensing arm 8, a reaction unit 9, a cuvette supplying unit 10, the primary BF separator 11, the secondary BF separator 12, a pipette tip supplying unit 13, a detector 14, a R4/R5 reagent supplying unit 15, and a reagent installing unit 16.

As shown in FIG. 3, each mechanism unit (reaction unit 9, primary BF separator 11, etc.) in the measurement mechanism section 2 is controlled by a CPU 2 a arranged in the measurement mechanism section 2. The CPU 2 a is communicably connected to the sample transporting section 3 and the control device 4, and has a function of receiving an operation command from the control device, transmitting measurement result data to the control device 4, transmitting an operation command to the sample transporting section 3, and the like.

The cuvette supplying unit 10 shown in FIG. 2 is configured to accommodate a plurality of cuvettes 100 (see FIG. 7), and has a function of sequentially supplying the cuvette one by one to a sample discharging position 200 by the sample dispensing arm 5. As shown in FIG. 7, the cuvette 100 is an elongate cylindrical container that has an opened upper end and a bottom which lower end is rounded, where the inner side surface and the outer side surface are formed to a circular shape in the horizontal cross-section. The cuvette 100 is formed with a projection that projects out to the outer side from the outer side surface of the upper end so as to be gripped by a catcher arranged at each area of the measurement mechanism section 2.

As shown in FIG. 2, the R1 reagent dispensing arm 6 is configured to aspirate the R1 reagent with a pipette 6 a from the R1 reagent container installed in the reagent installing unit 16, and dispense (discharge) the aspirated R1 reagent to the cuvette 100 mounted at the sample discharging position 200. The R1 reagent dispensing arm 6 also has a function of transferring the cuvette 100 mounted at the sample discharging position 200 to the reaction unit 9 by means of the catcher.

The pipette tip supplying unit 13 has a function of transporting the plurality of input pipette tips one by one to a tip attaching position 210 by means of the sample dispensing arm 5.

The sample dispensing arm 5 is configured to be movable, and has a function of aspirating the sample in the test tube transported to the sample aspirating position 220 by the sample transporting section 3, and dispensing (discharging) the sample into the cuvette at the sample discharging position 200, to which the R1 reagent is dispensed by the R1 reagent dispensing arm 6, after attaching the pipette tip at the tip attaching position 210.

The R2 reagent dispensing arm 7 is configured to aspirate the R2 reagent with a pipette 7 a from the R2 reagent container installed in the reagent installing unit 16, and dispense (discharge) the aspirated R2 reagent to the cuvette 100 accommodating the R1 reagent and the sample.

The reaction unit 9 is formed to a substantially circular ring shape so as to surround the periphery of the reagent installing unit 16 having a substantially circular shape when seen in plan view. The reaction unit 9 is configured to be rotatable, and has a function of moving the cuvette 100 held by a cuvette holder 9 a to each processing position where various types of processes (dispensing of reagent, etc.) are carried out. Specifically, the reaction unit 9 rotates in the direction of the arrow A1 to transport the cuvette 100 transferred to the reaction unit 9 by the R1 reagent dispensing arm 6 to each processing position of the R2 reagent dispensing arm 7, the primary BF separator 11, the R3 reagent dispensing arm 8, the secondary BF separator 12, and the R4/R5 reagent supplying unit 15 in such an order, and then transfers the same to the detector 14.

The primary BF separator 11 is configured to take out the cuvette 100 accommodating the sample, the R1 reagent, and the R2 reagent from the reaction unit 9 by means of a catcher 31 of a transfer arm 30, and separate (BF separate) the unreacted R1 reagent (unnecessary component) and the magnetic particles from the specimen in the cuvette 100. After the BF separation process is completed, the primary BF separator 11 returns the cuvette 100 to the reaction unit 9 by means of the catcher 31 of the transfer arm 30. The structure of the primary BF separator 11 will be described in detail later.

The R3 reagent dispensing arm 8 is configured to aspirate the R3 reagent with a pipette 8 a from the R3 reagent container installed in the reagent installing unit 16. The R3 reagent dispensing arm 8 is configured to dispense (discharge) the aspirated R3 reagent to the cuvette 100 accommodating the specimen after the BF separator by the primary BF separator 11.

The secondary BF separator 12 is configured to acquire the cuvette 100 accommodating the specimen and the R3 reagent of after the BF separation by the primary BF separator 11 from the reaction unit 9 with a catcher 12 b of the transfer arm 12 a, and separate (BF separation) the unreacted R3 reagent (unnecessary component) and the magnetic particles from the specimen in the cuvette. Thereafter, the secondary BF separator 12 is configured to return the cuvette 100 to the reaction unit 9 with the catcher 12 b of the transfer arm 12 a.

The R4/R5 reagent supplying unit 15 is configured to dispense the R4 reagent and the R5 reagent in order to the cuvette 100 accommodating the specimen after the BF separation by the secondary BF separator 12.

The detector 14 is arranged to measure the amount of antigen contained in a sample by obtaining the light generated in the reaction process of the labeled antibody bound to the antigen of the sample performed with a predetermined process and the light emitting substrate with a photo multiplier tube. The cuvette 100 is taken out from the reaction unit 9 by a cuvette transferring unit 17 including a catcher 17 a and set in the detector 14. The cuvette transferring unit 17 also has a function of taking out the cuvette 100 of after the measurement by the detector 14 is finished from the detector 14 and discarding the same in a discarding unit, other than transferring the cuvette 100 to the detector 14.

The reagent installing unit 16 is arranged to install the R1 reagent container accommodating the R1 reagent containing the capture antibody, the R2 reagent container accommodating the R2 reagent containing the magnetic particles, and the R3 reagent container accommodating the R3 reagent containing the labeled antibody each in plurals.

The configuration of the primary BF separator 11 will now be described in detail. The configuration of the secondary BF separator 12 is similar to the primary BF separator 11, and thus the description thereof will be omitted.

As shown in FIG. 4 to FIG. 6, the primary BF separator 11 mainly includes a transfer arm 30 with a catcher 31 for taking out the cuvette 100, a pre-magnetism collecting part 40, a movable installing part 50, a nozzle part 60, and a stirring part 70 (see FIG. 5). The movable installing part 50 includes four BF ports 51 a to 51 d (see FIG. 5) arranged side by side to install the cuvette 100 accommodating the sample, the R1 reagent, and the R2 reagent, and to carry out the BF separation process. The nozzle part 60 includes four nozzles 61 a to 61 d (see FIG. 6) corresponding to the four BF ports 51 a to 51 d. The stirring part 70 includes four stirring catchers 71 a to 71 d (see FIG. 5) corresponding to the four BF ports 51 a to 51 d. Thus, in the primary BF separator 11, the BF separation process can be carried out in parallel with respect to a maximum of four cuvettes 100 (specimen in cuvette 100) installed in each of the four BF ports 51 a to 51 d. In FIG. 6, a state in which the transfer arm 30 and the upper cover and the like of the movable installing part 50 are removed is schematically shown to show the structure of the BF ports 51 a to 51 d.

As shown in FIG. 5, the transfer arm 30 includes the catcher 31 for gripping the cuvette 100 at the distal end, and has a function of transferring the cuvette 100 among the pre-magnetism collecting part 40, the four BF ports 51 a to 51 d of the movable installing part 50, and the cuvette holder 9 a (see FIG. 2) of the reaction unit 9). Specifically, as shown in FIG. 4, the transfer arm 30 is configured to be able to turn (pivot) with a rotation shaft 36 extending in the up and down direction (Z direction) as a center and to be able to rise and lower in the up and down direction (Z direction) by an arm rotation motor 34 and an arm raising and lowering motor 35 connected through transmission mechanisms 32 and 33 including a belt and a pulley. The catcher 31 thus moves on a predetermined arcuate trajectory C (see FIG. 5) that passes through a cuvette installing portion 41, to be described later, of the pre-magnetism collecting part 40, the BF ports 51 a to 51 d, and the cuvette holder 9 a (take-out position 230 and return position 240, see FIG. 2), thus enabling the installing and the take-out of the cuvette 100 at each part. The transfer arm 30 includes a detection plate 30 a that integrally rotates with the rotation shaft 36, where the detection plate 30 a can be detected by a light transmissive sensor 30 b. The origin setting of the pivoting direction of the transfer arm 30 is carried out based on the detection result of the sensor 30 b.

The pre-magnetism collecting part 40 has a function of capturing the magnetic particles in the cuvette 100 in advance prior to the BF separation process carried out in each BF port 51 a to 51 d of the movable installing part 50. The pre-magnetism collecting part 40 includes one cuvette installing portion 41 arranged on the arcuate trajectory C of the transfer arm 30 (catcher 31) at the position on the near side (direction of arrow Y1) of the primary BF separator 11. As shown in FIG. 8, the cuvette installing portion 41 is configured to be able to arrange the cuvette 100 accommodating the sample, the R1 reagent, and the R2 reagent, and includes a hole having a shape corresponding to the outer shape of the cuvette 100. As shown in FIG. 7, the pre-magnetism collecting part 40 incorporates two in a set of permanent magnets 42 a and 42 b having a rectangular solid shape to magnetically capture the magnetic particles in the cuvette 100.

As shown in FIG. 5, the permanent magnets 42 a and 42 b are arranged to overlap the cuvette 100 set in the cuvette installing portion 41 when seen in plan view. More specifically, as shown in FIG. 7, the permanent magnets 42 a and 42 b are arranged at positions immediately below the cuvette 100 set in the cuvette installing portion 41, and are configured to magnetically capture (magnetism collect) the magnetic particles in the cuvette 100 from the lower side at such positions. The bottom of the cuvette installing portion 41 is formed to a curved surface that narrows in accordance with the shape of the bottom of the cuvette 100, and is formed with an opening 41 a (see FIG. 8) to expose the bottom of the set cuvette 100. The permanent magnets 42 a and 42 b are arranged at positions to be brought into contact with the bottom (outer bottom surface) of the cuvette 100 exposed from the opening 41 a of the cuvette installing portion 41 when the cuvette 100 is set in the cuvette installing portion 41. The magnets 42 a and 42 b may be arranged at positions slightly spaced apart from the bottom (outer bottom surface) of the cuvette 100 exposed from the opening 41 a of the cuvette installing portion 41.

As shown in FIG. 9, the two in a set of permanent magnets 42 a and 42 b are arranged next to each other horizontally, and are installed such that the upper surface side of one permanent magnet 42 a becomes the N pole (lower surface side is the S pole), and the upper surface side of the other permanent magnet 42 b becomes the S pole (lower surface side is the N pole). The intermediate position (on boundary line) of the two in a set of permanent magnets 42 a and 42 b arranged horizontally thus has the strongest magnetic force. The permanent magnets 42 a and 42 b are arranged such that the intermediate part, where the magnetic force is the strongest, is positioned immediately below the lower end of the cuvette 100 set in the cuvette installing portion 41. The magnetic particles in the cuvette 100 are thus reliably captured at the inner bottom surface (lowest position) of the cuvette 100. The pre-magnetism collecting part 40 is made of non-magnetic aluminum (alloy), so that the magnetic line of force (see FIG. 9) by the permanent magnets 42 a and 42 b passes through without barely being inhibited by the peripheral wall surrounding the cuvette 100 and reaches the cuvette 100.

As shown in FIG. 8, a detection piece 43 a that can advance to the inside of the cuvette installing portion 41 and retreat from the inside, and a light transmissive cuvette sensor 43 b (see broken line in FIG. 8) for detecting the detection piece 43 a are arranged on the side surface side of the cuvette installing portion 41. The detection piece 43 a light shields the cuvette sensor 43 b if the cuvette 100 is not set. The detection piece 43 a turns in the direction of the arrow R with the setting of the cuvette 100 in the cuvette installing portion 41, so that the light shielding by the detection piece 43 a can be released (see chain dashed line in FIG. 8). Whether or not the cuvette 100 is set in the pre-magnetism collecting part 40 (cuvette installing portion 41) then can be detected.

As shown in FIG. 5, the movable installing part 50 includes four BF ports 51 a to 51 d arranged at equal interval in a straight line in the horizontal direction (X direction). The movable installing part 50 is configured to be horizontally movable in the Y direction by the horizontal movement motor 53 (see FIG. 6) connected through the transmission mechanism 52 including the belt and the pulley. Therefore, the movable installing part 50 has a function of arranging each of the four BF ports 51 a to 51 d to the position (cuvette setting position) on the arcuate trajectory C of the transfer arm 30 (catcher 31), the position (aspirating/discharging position) immediately below the nozzle 61 a to 61 d corresponding to each of the BF ports 51 a to 51 d, and the cuvette take-out position of the stirring catcher 71 a to 71 d corresponding to each of the BF ports 51 a to 51 d. As apparent from FIG. 5, the position (cuvette setting position) where each of the BF ports 51 a to 51 d that moves in the Y direction intersects the arcuate trajectory C differs from each other with respect to the Y direction. Thus, the movable installing part 50 is controlled to change the movement position in the Y direction depending on which of the BF ports 51 a to 51 d to set the cuvette 100 transferred from the transfer arm 30.

As shown in FIG. 6, each of the BF ports 51 a to 51 d of the movable installing part 50 has the same structure, and includes a hole in which the cuvette 100 can be arranged. Each of the BF ports 51 a to 51 d includes two in a set of permanent magnets 54 a and 54 b having a rectangular solid shape, and is configured to capture the magnetic particles in the cuvette 100 installed in the BF ports 51 a to 51 d. The permanent magnets 54 a and 54 b of the BF ports 51 a to 51 d are arranged to be positioned at the side of the set cuvette 100, as opposed to the permanent magnets 42 a and 42 b of the pre-magnetism collecting part 40. Specifically, as shown in FIG. 5 and FIG. 7, the permanent magnets 54 a and 54 b are arranged at the positions on the side on the near side (direction of arrow Y1) of the cuvette 100 installed in the BF ports 51 a to 51 d.

As shown in FIG. 9, the two in a set of permanent magnets 54 a and 54 b are arranged next to each other vertically, and are installed such that the side surface side on the cuvette 100 side (direction of arrow Y2) of the upper permanent magnet 54 a becomes the S pole (direction of arrow Y1 is the N pole), and the side surface side on the cuvette 100 side (direction of arrow Y2) of the lower permanent magnet 54 b becomes the N pole (direction of arrow Y1 is the S pole). The position of intermediate height (on boundary line) of the two in a set of permanent magnets 54 a and 54 b arranged vertically thus has the strongest magnetic force. Therefore, the magnetic particles in the cuvette 100 installed in the BF port 51 a to 51 d are captured at the inner side surface at the height position on the upper side than the inner bottom surface by the permanent magnets 54 a and 54 b.

In the BF separation process, the cuvette 100 in which the magnetic particles are captured in advance by the pre-magnetism collecting part 40 is taken out from the pre-magnetism collecting part 40 by the transfer arm 30 (catcher 31), and transferred to one of the four BF ports 51 a to 51 d. Thus, when the cuvette 100 is installed at one of the BF ports 51 a to 51 d, the magnetic particles in the cuvette 100 are already collected in a lump at the inner bottom surface side of the cuvette 100. When the cuvette 100 is installed in one of the BF ports 51 a to 51 d, the lump of magnetic particles collected at the inner bottom surface of the cuvette 100 moves to the capturing position of the inner side surface on the upper side along the inner wall of the cuvette 100 in the lump state by the magnetic force of the permanent magnets 54 a and 54 b at the side. The magnetic force is not applied on the magnetic particles in the cuvette 100 from when the cuvette 100 is taken out by the transfer arm 30 in the pre-magnetism collecting part 40 until the cuvette 100 is set in one of the BF ports 51 a to 51 d, but the magnetic particles in the cuvette 100 maintain the state collected at the inner bottom surface of the cuvette 100 by the own weight of the magnetic particles. Thus, the magnetic particles can be rapidly captured in the BF ports 51 a to 51 d even if the magnetic force is not continuously applied on the magnetic particles when the cuvette 100 is being transferred.

As shown in FIG. 5, the transfer arm 30 has a structure of pivoting about the rotation shaft 36, and hence the cuvettes 100 to be set in the four BF ports 51 a to 51 d are set in different directions according to the rotation angle of the transfer arm 30 when seen in plan view. In the present embodiment, the magnetic particles are captured at the inner bottom surface of the cuvette 100 in the pre-magnetism collecting part 40, and the magnetic particles are captured at the inner side surface of the cuvette 100 having a circular shape in horizontal cross-section in each of the BF ports 51 a to 51 d. Thus, the BF separation process can be carried out with the magnetic particles captured in the same exact manner in each of the BF ports 51 a to 51 d even if the direction of the cuvette 100 when set in each of the BF ports 51 a to 51 d differs according to the rotation angle of the transfer arm 30.

As shown in FIG. 7, each of the BF ports 51 a to 51 d of the movable installing part 50 also includes a detection piece 55 a, and a light transmissive cuvette sensor 55 b (see FIG. 3) for detecting the detection piece 55 a similar to the pre-magnetism collecting part 40. Thus, whether or not the cuvette 100 is set in each of the four BF ports 51 a to 51 d can be detected.

As shown in FIG. 5, the nozzle part 60 includes four nozzles 61 a to 61 d arranged at equal interval in a straight line in the horizontal direction (X direction) in correspondence with the four BF ports 51 a to 51 d. As shown in FIG. 4, the nozzle part 60 is configured to be able to rise and lower in the up and down direction (Z direction) by a nozzle raising and lowering motor 63 connected through a transmission mechanism 62 including a belt and a pulley. Therefore, the four nozzles 61 a to 61 d integrally rise and lower by one nozzle raising and lowering motor 63 of the nozzle part 60. The nozzle part 60 thus has a function of advancing (lowering) the four nozzles 61 a to 61 d to inside the cuvette 100 set in the four BF ports 51 a to 51 d or retreating (raising) the four nozzles 61 a to 61 d from inside the cuvette 100 while being arranged at the position (aspirating/discharging position) immediately below each nozzles 61 a to 61 d, to which the four BF ports 51 a to 51 d correspond, by the movement of the movable installing part 50.

The four nozzles 61 a to 61 d have the same structure, and have a structure in which three nozzles, a discharging nozzle for discharging the cleaning liquid, an aspirating nozzle for aspirating the liquid (unreacted substance) in the cuvette 100, and a cleaning nozzle for discharging the cleaning liquid for cleaning the discharging nozzle and the aspirating nozzle, form a set. The cleaning port is arranged at the position on the lower side of the four nozzles 61 a to 61 d, respectively, so that the nozzles 61 a to 61 d themselves can be cleaned. The aspiration and discharge of the four nozzles 61 a to 61 d can be individually operated, where control is performed such that the aspirating and discharging operation of the corresponding nozzles 61 a to 61 d is not carried out when the cuvette 100 is not set in one of the four BF ports 51 a to 51 d.

Furthermore, as shown in FIG. 9, when aspirating the liquid (unreacted substance) in the cuvette 100 with the nozzles 61 a to 61 d, such aspiration is carried out with the distal end of the nozzles (aspirating nozzle) 61 a to 61 d lowered to the vicinity of the bottom (inner bottom surface) of the cuvette 100. The magnetic particles can be suppressed from being aspirated when aspirating the liquid (unreacted substance) since the magnetic particles are captured on the inner side surface side spaced apart to the upper side from the bottom of the cuvette 100 in the BF ports 51 a to 51 d.

As shown in FIG. 5, the stirring part 70 includes four stirring catchers 71 a to 71 d arranged at equal interval in a straight line in the horizontal direction (X direction) in correspondence with the four BF ports 51 a to 51 d. As shown in FIG. 6, the stirring part 70 is configured to be able to rise and lower in the up and down direction (Z direction) by a stirring part raising and lowering motor 73 connected through a transmission mechanism 72 including a belt and a pulley. Thus, the four stirring catchers 71 a to 71 d integrally rise and fall by one stirring part rising and lowering motor 73 of the stirring part 70. Thus, the stirring part 70 has a function of causing the corresponding stirring catchers 71 a to 71 d to grip the cuvettes 100 of the four BF ports 51 a to 51 d by lowering such that the stirring catchers 71 a to 71 d are arranged at the cuvette take-out positions at where the cuvette 100 set in each of the BF ports 51 a to 51 d can be gripped. The stirring part 70 can also take out the cuvette 100 from the BF ports 51 a to 51 d, and return the cuvette 100 taken out to each of the BF ports 51 a to 51 d by rising or lowering while gripping the cuvette of each of the BF ports 51 a to 51 d with the corresponding stirring catcher 71 a to 71 d.

Each of the four stirring catchers 71 a to 71 d include each of stirring motors 74 a to 74 d (see FIG. 3) for oscillating (vibrating) the stirring catchers 71 a to 71 d. The stirring catchers 71 a to 71 d have a function of stirring the magnetic particles inside the cuvette 100 by driving the stirring motor 74 a to 74 d while gripping the cuvette 100 and taking out the same from the BF ports 51 a to 51 d (state in which the magnetic particles are not captured by the permanent magnets 54 a and 54 b). The unreacted substance and the like sandwiched between the magnetic particles captured to a lump thus can be dispersed. The stirring motors 74 a to 74 d arranged in the four stirring catchers 71 a to 71 d can be individually driven. Thus, control can be made not to carry out the stirring operation by the corresponding stirring catcher 71 a to 71 d when the cuvette 100 is not set in one of the four BF ports 51 a to 51 d.

According to the above configuration, in the primary BF separator 11, the BF separation process can be individually carried out by the corresponding nozzles 61 a to 61 d and the stirring catchers 71 a to 71 d in each of the four BF ports 51 a to 51 d. In the BF separation process, the operation of aspirating (removing) the liquid in the cuvette 100 with the corresponding nozzles 61 a to 61 d with the magnetic particles captured in the BF ports 51 a to 51 d, the operation of discharging the cleaning liquid into the cuvette 100 with the corresponding nozzles 61 a to 61 d, and the operation of stirring the specimen in the cuvette 100 with the corresponding stirring catchers 71 a to 71 d are repeatedly carried out over plural times. The concentration of the unreacted substance inside the cuvette 100 thus can be lowered in a step-wise manner while leaving the magnetic particles, so that the complex of the magnetic particles, the antigen, and the capture antibody, and the unreacted substance can be separated (BF separation).

As shown in FIG. 2, in the present embodiment, all the cuvettes 100 supplied in the BF separation process pass through the same transport path (reaction unit 9 and transfer arm 30) until transferred to the pre-magnetism collecting part 40. Each cuvette 100 is transferred to a different transport path when being transferred to either one of the BF ports 51 a to 51 d from the pre-magnetism collecting part 40.

The BF separation processing operation of the primary BF separator 11 of the immune analyzer 1 (measurement mechanism section 2) according to one embodiment of the present invention will now be described with reference to FIG. 2, FIG. 3, FIG. 5, and FIG. 9 to FIG. 12. The BF separation processing operation by the primary BF separator 11 operates at a predetermined timing set in advance according to the timing chart shown in FIG. 10 to synchronize with the dispensing operation by various dispensing arms and the transportation of the cuvette 100 by the reaction unit 9 as one part of the measurement processing operation of the entire immune analyzer 1. The BF separation process by the primary BF separator 11 is carried out in parallel with respect to a maximum of four cuvettes 100 (specimen in cuvette 100) by the four BF ports 51 a to 51 d.

The BF separation process is mainly configured by the pre-magnetism collecting (capturing of magnetic particles by magnetic force) process in the pre-magnetism collecting part 40, and the BF cleaning process (aspirating/discharging process of three times and aspirating process). Since the transfer of the cuvette 100 to the reaction unit 9, the pre-magnetism collecting part 40 and each of the BF ports 51 a to 51 d is carried out by one transfer arm 30, the processing operation in each of the BF ports 51 a to 51 d is carried out in parallel while shifting time. In the following, an example in which the cuvette 100 is transferred to the respective BF port in the order of the BF port 51 a (port A), 51 b (port B), 51 c (port C), and 51 d (port D), and the BF separation process is performed in such an order will be described.

As shown in FIG. 10, the cuvette 100 is transferred from the reaction unit 9 to the pre-magnetism collecting part 40 at timing t1. The cuvette 100 arranged at the take-out position 230 (see FIG. 2) of the reaction unit 9 is taken out by the transfer arm 30 and transferred to the pre-magnetism collecting part 40. The transfer timing of the cuvette 100 to the pre-magnetism collecting part 40 is set for every predetermined time interval, where the transfer timing t32 of the next (second test) cuvette 100 is reached after the first (first test) cuvette 100 is transferred from the pre-magnetism collecting part 40 to the BF port 51 a. When the cuvette 100 of the first test is transferred to the pre-magnetism collecting part 40, the pre-magnetism collecting process held in the pre-magnetism collecting part 40 is carried out during a predetermined time until timing t2. The magnetic particles are thereby captured at the bottom of the cuvette 100 set in the pre-magnetism collecting part 40 (see FIG. 9).

At timing t2, the transfer arm 30 is driven, and the cuvette 100 of the first test is taken out from the pre-magnetism collecting part 40 and transferred to the empty BF port 51 a (port A). The transfer timing to the BF port is set for every predetermined time interval. When the pre-magnetism collecting process of the next (second test) cuvette 100 is terminated after the first (first test) cuvette 100 is transferred from the pre-magnetism collecting part 40 to the BF port 51 a, a timing t38 of transferring the next (second test) cuvette 100 to the BF port 51 b (port B) is reached.

At timing t3, the BF cleaning process (aspirating/discharging process) is started on the cuvette of the first test. The BF cleaning process is configured by the aspirating/discharging processes (1) to (3) of three times performed at timings t3, t4, and t5 set for every predetermined time interval, and the aspirating process performed at timing t6 after the termination of the aspirating/discharging process of three times with respect to one cuvette 100 (specimen). The BF cleaning process is the same in each BF port, and thus the BF cleaning process on the cuvette 100 of the first test in the BF port 51 a (port A) will be described.

As shown in FIG. 11, when the cuvette 100 of the first test is set in the BF port 51 a at the start timing t3 of the BF cleaning process (aspirating/discharging process), the magnetism collecting process is performed until timing t30 in the BF port 51 a. The magnetic particles are thereby captured on the inner side surface of the cuvette 100 (see FIG. 9) in the BF port 51 a where the cuvette 100 is set. The movable installing part 50 moves so that the BF ports 51 a to 51 d are positioned at the aspirating/discharging positions (positions immediately below nozzles 61 a to 61 d) by the nozzles 61 a to 61 d during the magnetism collecting process.

At timing t30, the liquid inside the cuvette 100 of the first test is aspirated. Specifically, as shown in FIG. 9, the nozzle part 60 is lowered with the magnetic particles in the cuvette 100 captured, the nozzles 61 a to 61 d corresponding to each of the BF ports 51 a to 51 d are advanced into the cuvette 100, and the liquid is aspirated by the nozzles 61 a to 61 d. Since the cuvette 100 is not set in the BF ports 51 b to 51 d in the first test (BF cleaning process is not started), the nozzles 61 b to 61 d are positioned up to the aspirating/discharging position in the BF ports 51 b to 51 d, respectively, but the aspirating operation is not carried out. This is the same in each process below, where the movement of the movable installing part 50, the raising and lowering movement of the nozzle part 60 and the stirring part 70 are carried out in synchronization in each of the BF ports 51 a to 51 d, but the aspiration of the liquid, the discharging of the cleaning liquid, and the stirring are not carried out in the BF port in which the BF cleaning process has not started.

After the aspiration of the liquid, a predetermined amount of cleaning liquid is discharged from the nozzle 61 a to the cuvette of the first test at timing t31, and then the nozzle part 60 is raised to retreat the nozzle 61 a from inside the cuvette 100.

Thereafter, the magnetism collecting process is carried out at timing t32, and the liquid inside the cuvette 100 of the first test is aspirated at timing t33. At timing t34, a predetermined amount of cleaning liquid is discharged from the nozzle 61 a, and then the nozzle part 60 is raised to retreat the nozzle 61 a from inside the cuvette 100. That is, the magnetism collecting process, the aspiration of the liquid, and the discharging of the cleaning liquid are carried out two times respectively in one BF cleaning process. Timing t32 becomes the timing to transfer the cuvette of the second test to the pre-magnetism collecting part 40. Therefore, the movement process of the next (second test) cuvette 100 to the pre-magnetism collecting part 40 is started, and the pre-magnetism collecting is started from timing t35.

Thereafter, at timing t35, the stirring part 70 is lowered, each of the stirring catchers 71 a to 71 d is positioned at the cuvette take-out position, the movable installing part 50 is moved, and the cuvette 100 of the BF port 51 a is gripped by the corresponding stirring catcher 71 a.

At timing t36, the stirring part 70 (see FIG. 5) is raised, the gripped cuvette 100 is taken out from the BF port 51 a, the stirring motor 74 a (see FIG. 3) of the stirring catcher 71 a is driven, and the stirring process is performed in a state the magnetic particles are not collected. Subsequently, the stirring part 70 is lowered, and the cuvette 100 is returned from the stirring catcher 71 a to the corresponding BF port 51 a.

After the stirring, the magnetism collecting process is carried out for a predetermined time (until next timing t4) to again capture the dispersed magnetic particles with the permanent magnets 54 a and 54 b at timing t37. One BF cleaning operation is then terminated.

While performing the magnetism collecting process, the transfer process of the next (second test) cuvette 100 to the BF port 51 b (port B) is carried out at timing t38. Therefore, when reaching the timing t4 at when the aspirating/discharging process is started next, the aspirating/discharging process of the second time with respect to the cuvette 100 of the first test is carried out in the BF port 51 a (port A), and the BF cleaning process (aspirating/discharging process of first time) with respect to the cuvette 100 of the second test is started in the BF port 51 b (port B). Thus, during the BF cleaning process, the cuvette 100 is transferred to the next empty BF port (BF port 51 b herein) not holding the cuvette 100 when the nozzle 61 a (61 b to 61 d) is extracted from inside the cuvette 100. The content of the BF cleaning process is the same, and hence the same BF cleaning processing operation is executed in the BF port 51 a and the BF port 51 b in synchronization. The third subsequent tests are also the same, as shown in FIG. 10.

In the BF port 51 a in which the aspirating/discharging operation is carried out three times, the aspirating process is carried out at the next timing t6. The aspirating process is carried out in synchronization with the BF cleaning process in other BF ports.

As shown in FIG. 12, in the aspirating process, the magnetism collecting process is performed in the BF port 51 a at timing t6, and the liquid inside the cuvette 100 is aspirated by the nozzle 61 a at timing t61.

At timing t62, the magnetism collecting process is again performed until timing t64 (discharging of cleaning liquid is not carried out) with respect to the cuvette of the first test, as opposed to the aspirating/discharging process. Timing t63 becomes the timing to transfer the cuvette 100 of the fifth test to the pre-magnetism collecting part 40. The cuvette 100 of the fifth test is thereby transferred from the reaction unit 9 to the pre-magnetism collecting part 40 by the transfer arm 30. The cuvette 100 of the fifth test becomes the next cuvette 100 to be set in the BF port 51 a after the BF cleaning process on the cuvette 100 of the first test is completed.

At timing t64, the liquid inside the cuvette 100 of the first test is again aspirated. Thereafter, at timing t65, the magnetism collecting process is performed (discharging of liquid is not carried out) with respect to the cuvette of the first test, as opposed to the aspirating/discharging process.

At timing t66, the stirring part 70 is lowered, and the movable installing part 50 is moved to cause the corresponding stirring catcher 71 a to grip the cuvette 100 of the BF port 51 a.

Next, at timing t67, the stirring part 70 is raised, the gripped cuvette 100 is taken out from the BF port 51 a and the stirring motor 74 a of the stirring catcher 71 a is driven so that the stirring process is performed. Subsequently, the stirring part 70 is lowered, and the cuvette 100 is returned from the each stirring catcher 71 a to the corresponding BF port 51 a.

The aspirating process is then terminated. As shown in FIG. 10, the transfer arm 30 is driven at the transfer timing t7 to the reaction unit after the stirring, so that the cuvette 100 is taken out from the BF port 51 a (port A) and the cuvette 100 is returned to the reaction unit 9 at a predetermined return position 240 (see FIG. 2). The BF cleaning process on the cuvette 100 of the first test is thereby completed.

When the cuvette 100 of the first test is returned to the reaction unit 9, the cuvette 100 of the fifth test is taken out from the pre-magnetism collecting part 40 by the transfer arm 30 and transferred to the empty BF port 51 a (port A) at timing t71. In the BF port 51 a (port A), the BF cleaning process on the next (fifth test) cuvette 100 (specimen) is started.

The BF cleaning process in each of the BF ports 51 a to 51 d is started individually in the order set by the transfer arm 30, where some processes (aspirating/discharging process and aspirating process) are performed in parallel. The cuvette 100 is returned to the reaction unit 9 by the transfer arm 30 in the order the BF cleaning process is completed in each of the BF ports 51 a to 51 d.

A control process in the BF separation process of the primary BF separator 11 of the immune analyzer 1 (measurement mechanism section 2) according to one embodiment of the present invention will now be described with reference to FIG. 2, FIG. 3, FIG. 5, and FIG. 10 to FIG. 16.

The control process in the BF separation process is configured by four processes performed at each timing shown in FIG. 10 to FIG. 12, where such processes are performed in parallel. Specifically, the four processes are a transfer process (take-out) of the cuvette 100 from the reaction unit 9 to the pre-magnetism collecting part 40, a transfer process of the cuvette 100 from the pre-magnetism collecting part 40 to the BF port (one of 51 a to 51 d), a BF cleaning process (aspirating/discharging process and aspirating process) in each of the BF ports 51 a to 51 d, and a transfer process (return) of the cuvette 100 from the BF port (one of 51 a to 51 d) to the reaction unit 9. The BF separation processing operation by the primary BF separator 11 is performed when each portion of the primary BF separator 11 is controlled by the CPU 1 a of the measurement mechanism section 2. The BF separation process by the secondary BF separator 12 is similar, and hence the description thereof will be omitted.

First, the transfer process of the cuvette 100 from the reaction unit 9 to the pre-magnetism collecting part 40 shown in FIG. 13 will be described.

In the transfer process to the pre-magnetism collecting part 40, whether or not the transfer timing (timing t1, timing t32, etc.) (see FIG. 10) of the cuvette 100 to the pre-magnetism collecting part 40 is determined by the CPU 2 a in step S1. If not the transfer timing to the pre-magnetism collecting part 40, the transfer of the cuvette 100 from the reaction unit 9 to the pre-magnetism collecting part 40 is not performed.

If the transfer timing of the cuvette 100 to the pre-magnetism collecting part 40, in step S2, a predetermined cuvette 100 is taken out from the take-out position 230 (see FIG. 2) of the reaction unit 9 by the transfer arm 30 and set in the cuvette installing portion 41 of the pre-magnetism collecting part 40. In step S3, whether or not the cuvette 100 is set in the cuvette installing portion 41 of the pre-magnetism collecting part 40 is determined based on the detection result of the cuvette installing portion 41 by the cuvette sensor 43 b.

If set in the cuvette installing portion 41, the transfer process of the cuvette 100 to the pre-magnetism collecting part 40 is terminated. If the detection by the cuvette sensor 43 b cannot be recognized, the process proceeds to step S4. a predetermined abnormality (error) process is carried out, and the process is terminated. When the transfer process to the pre-magnetism collecting part 40 is performed every time the transfer timing to the pre-magnetism collecting part 40 is reached, the cuvette 100 to be processed is sequentially transferred from the take-out position 230 of the reaction unit 9 to the pre-magnetism collecting part 40.

The transfer process of the cuvette 100 to the BF port shown in FIG. 14 will now be described.

First, in step S11, whether or not the transfer timing (timing t2, timing t38, etc.) (see FIG. 10) to the BF port (one of 51 a to 51 d) is determined. If not the transfer timing to the BF port, the transfer of the cuvette 100 from the pre-magnetism collecting part 40 to one of the BF ports 51 a to 51 d is not performed.

If the transfer timing to the BF port, the process proceeds to step S12, the transfer arm 30 is driven, and the cuvette 100 is taken out from the cuvette installing portion 41 of the pre-magnetism collecting part 40 by the catcher 31 and transferred to the empty BF port in the order of BF port 51 a, 51 b, 51 c, and 51 d. In this case, as shown in FIG. 5, the movable installing part 50 moves in synchronization with the transfer arm 30 so that the BF port (one of 51 a to 51 d), or the transfer destination, is positioned on the arcuate trajectory C of the catcher 31.

In step S13, whether or not the pre-magnetism collecting part 40 (cuvette installing portion 41) is empty (whether or not cuvette 100 is normally taken out) is determined based on the detection result of the cuvette installing portion 41 by the cuvette sensor 43 b. If determined that the pre-magnetism collecting part 40 (cuvette installing portion 41) is not empty, the process proceeds to step S14, a predetermined abnormality (error) process is carried out, and then the process is terminated.

If determined that the pre-magnetism collecting part 40 (cuvette installing portion 41) is empty, the process proceeds to step S15, and whether or not the cuvette 100 is transferred to the BF port (one of 51 a to 51 d) of the transfer destination based on the detection result of the BF port (one of 51 a to 51 d) of the transfer destination by the cuvette sensor 55 b (see FIG. 3). If determined as transferred to the BF port (one of 51 a to 51 d) of the transfer destination, the transfer process of the cuvette 100 to the relevant BF port (one of 51 a to 51 d) is terminated. If the detection of the BF port (one of 51 a to 51 d) or the transfer destination by the cuvette sensor 55 b is not recognized, the process proceeds to step S14, a predetermined abnormality (error) process is carried out, and then the process is terminated. When the transfer process to the BF port is performed every time the transfer timing to the BF port is reached, the cuvette 100 to be processed is transferred in order from the pre-magnetism collecting part 40 to the empty BF port (one of 51 a to 51 d).

The BF cleaning process in the BF ports 51 a to 51 d shown in FIG. 15 will now be described. As described above, the BF cleaning process is configured by the aspirating/discharging processes (1) to (3) of three times, and the aspirating process (see FIG. 11) after the termination of the aspirating/discharging process.

In the BF cleaning process, a variable i indicating the number of executions of the aspirating/discharging process is set to “1” (initialization) in step S21. In step S22, whether or not the start timing (timing t3, t4, t5, t6, etc.) of the processing operation is determined. If not the start timing of the processing operation, the determination of step S22 is repeated until the next operation start timing.

When the start timing of the processing operation is reached, the process proceeds to step S23 and whether or not the variable i is “4” is determined. If the variable i is not “4”, the process proceeds to step S24, and the aspirating/discharging process is performed. As shown in FIG. 11, in the aspirating/discharging process, each part of the movable installing part 50, the nozzle part 60, the stirring part 70, and the like is controlled such that each process is performed at a predetermined timing.

When the aspirating/discharging process is terminated, “1” is added to the variable i indicating the number of executions of the aspirating/discharging process in step S25. The process then proceeds to step S22, and the next operation start timing is waited. Since the variable i becomes “4” when steps S22 to S25 are repeated three times (aspirating/discharging process is performed three times), the process proceeds from step S23 to step S26.

In step S26, the aspirating process is carried out. As shown in FIG. 12, in the aspirating process, each part of the movable installing part 50, the nozzle part 60, the stirring part 70, and the like is controlled such that each process is performed at a predetermined timing. The BF cleaning process in the BF ports 51 a to 51 d is completed when the aspirating process of step S26 is completed. The BF cleaning process in the BF ports 51 a to 51 d is determined for each of the BF ports 51 a to 51 d, so that the stage of the process in each of the BF ports 51 a to 51 d (which number of aspirating/discharging process) differs depending on the BF port as shown in FIG. 10.

The transfer process of the cuvette 100 from the BF port 51 a to 51 d to the reaction unit 9 shown in FIG. 16 will now be described.

In the transfer process to the reaction unit 9, whether or not the transfer timing (timing t7, etc.) (see FIG. 10) of the cuvette 100 to the reaction unit 9 is determined in step S31. If not the transfer timing to the reaction unit 9, the transfer of the cuvette 100 from the BF port 51 a to 51 d to the reaction unit 9 is not performed.

If the transfer timing of the cuvette 100 to the reaction unit 9, in step S32, the movable installing part 50 is driven and the BF port 51 a to 51 d in which the cuvette 100 to be transferred is set is positioned on the arcuate trajectory C (see FIG. 5) of the catcher 31, and the transfer arm 30 is also driven and the cuvette 100 to be transferred of the BF port 51 a to 51 d is taken out by the catcher 31. The cuvette 100 is set in the cuvette holder 9 a of the reaction unit 9 at a predetermined return position 240 (see FIG. 2) on the arcuate trajectory C.

In step S33, whether or not the BF port 51 a to 51 d is empty (whether or not the cuvette is normally taken out) is determined based on the detection result of the BF port 51 a to 51 d holding the cuvette 100 to be transferred by the cuvette sensor 55 b.

If the BF port 51 a to 51 d is empty, the transfer process of the cuvette 100 from the BF port 51 a to 51 d to the reaction unit 9 is terminated. If the detection of the BF port 51 a to 51 d holding the cuvette 100 to be transferred by the cuvette sensor 55 b (detection of cuvette 100 is not present) is not recognized, determination is made that the BF port 51 a to 51 d is not empty, whereby the process proceeds to step S34, a predetermined abnormality (error) process is carried out, and then the process is terminated. When the transfer process to the reaction unit 9 is performed every time the transfer timing to the reaction unit 9 is reached, the cuvette is transferred from the BF port 51 a to 51 d to the reaction unit 9 in order from the cuvette 100 in which the BF cleaning process is completed.

In the present embodiment, the permanent magnets 42 a and 42 b of the pre-magnetism collecting part 40 are arranged on the lower side of the cuvette 100 arranged in the pre-magnetism collecting part 40, and are configured to magnetically capture the magnetic particles in the cuvette 100 while being arranged on the lower side of the cuvette 100. According to such a configuration, the cuvette 100 is transferred to the BF ports 51 a to 51 d by the transfer arm 30 with the magnetic particles captured at the inner bottom surface of the cuvette 100, and hence the time required for the magnetism collecting process in the BF ports 51 a to 51 d can be reduced compared to when carrying out the magnetism collecting process from a state the magnetic particle are spread out in the cuvette 100 in the BF ports 51 a to 51 d. The BF cleaning process on the liquid in the cuvette 100 thus can be rapidly started. Furthermore, since the state in which the magnetic particles are collected at the bottom of the cuvette 100 by own weight can be maintained, a configuration of continuously applying magnetic force while transferring the cuvette 100 from the pre-magnetism collecting part 40 to the BF ports 51 a to 51 d does not need to be adopted. Therefore, in the immune analyzer 1 according to the present embodiment, the sample processing ability by the immune analyzer 1 can be enhanced, and the degree of freedom in the apparatus configuration of the immune analyzer 1 (primary BF separator 11, secondary BF separator 12) can be enhanced.

Furthermore, in the present embodiment, each of the BF ports 51 a to 51 d includes each of nozzles 61 a to 61 d, and a permanent magnet 54 a (54 b) arranged at the side of the cuvette 100 arranged in the BF ports 51 a to 51 d. With such a configuration, the magnetic particles are captured at the inner side surface of the cuvette 100 in the BF ports 51 a to 51 d, so that the magnetic particles can be suppressed from being aspirated by the nozzles 61 a to 61 d even if the nozzles 61 a to 61 d are inserted to the vicinity of the bottom of the cuvette 100 when aspirating the liquid in the cuvette 100. Since a greater amount of liquid can be aspirated by inserting the nozzles 61 a to 61 d to the vicinity of the bottom of the cuvette 100 to aspirate the liquid, a greater amount of liquid containing unreacted substances can be removed. The separation (aspiration of liquid) of the magnetic particles and the liquid in the cuvette 100 is thus easily carried out.

In the present embodiment, each of the BF ports 51 a to 51 d and the pre-magnetism collecting part 40 are configured to capture the magnetic particles at the circular inner side surface of the cuvette 100 in the BF ports 51 a to 51 d after the magnetic particles are captured at the bottom surface of the cuvette 100 in the pre-magnetism collecting part 40. According to such a configuration, the magnetic particles are captured at the inner side surface of the cuvette 100 having a circular cross-section when being captured at the inner side surface of the cuvette 100 in each of the BF ports 51 a to 51 d, so that the magnetic particles can always be captured in the same manner regardless of the direction (position in rotation direction) of the cuvette 100 arranged in the BF port 51 a to 51 d by the transfer arm 30. As a result, the performance of the BF separation process is prevented from differing depending on the direction of the cuvette 100 arranged in the BF port 51 a to 51 d by the transfer arm 30.

In the present embodiment, the permanent magnet 42 a (42 b) of the pre-magnetism collecting part 40 is arranged at a position proximate to the bottom of the cuvette 100 arranged in the pre-magnetism collecting part 40. According to such a configuration, a stronger magnetic force can be applied to the bottom of the cuvette 100, so that the magnetic particles can be more effectively captured at the bottom of the cuvette 100.

In the present embodiment, the permanent magnet 42 a (42 b) of the pre-magnetism collecting part 40 is arranged at a position immediately below the cuvette 100 arranged in the pre-magnetism collecting part 40. According to such a configuration, the magnetic force can be applied from the position immediately below the cuvette 100 arranged in the pre-magnetism collecting part 40 to the bottom of the cuvette 100, and hence the magnetic particles can be captured in a concentrated manner at the bottom of the cuvette 100.

In the present embodiment, the transfer arm 30 is configured to take out the cuvette 100 arranged in the pre-magnetism collecting part 40 with the catcher 31 and transfer the same to each of the BF ports 51 a to 51 d. According to such a configuration, the BF ports 51 a to 51 d and the pre-magnetism collecting part 40 may be separate and independent mechanisms, so that the degree of freedom of the device configuration of the primary BF separator 11 (secondary BF separator 12) can be further enhanced.

In the present embodiment, the transfer arm 30 is configured to take out the cuvette 100 from the pre-magnetism collecting part 40 with the catcher 31 and transfer the same to one of the BF ports 51 a to 51 d. According to such a configuration, the BF separation process in a plurality of cuvettes 100 can be carried out in parallel, so that the sample processing ability of the immune analyzer 1 can be further enhanced.

In the present embodiment, the plurality of BF ports 51 a to 51 d are configured to complete the BF cleaning process by carrying out the discharging of the cleaning liquid to the cuvette 100 arranged in each BF port and the aspiration of the liquid in the cuvette 100 for plural times by the corresponding nozzles 61 a to 61 d. According to such a configuration, the BF separation process in the individual BF ports 51 a to 51 d can be completed by repeating the discharging of the cleaning liquid and the aspiration of the liquid over plural times with the corresponding nozzles 61 a to 61 d. Therefore, in the individual BF ports 51 a to 51 d, the concentration of the unreacted substance in the cuvette 100 can be lowered in a step-wise manner with the same nozzle (61 a to 61 d), so that the dirt attached to each nozzles 61 a to 61 d when the concentration of the unreacted substance is high can be reduced with advancement of the BF cleaning process. Thus, the possibility of the carryover when performing the BF cleaning process on the next sample occurring can be suppressed, and consequently, the time required for the cleaning of the nozzles 61 a to 61 d themselves to prevent the occurrence of the carryover can be suppressed from increasing, so that the sample processing ability of the immune analyzer 1 can be further enhanced.

In the present embodiment, the transfer arm 30 is configured to transfer the cuvette 100 from the pre-magnetism collecting part 40 to the BF ports 51 a to 51 d without the magnetic force applied on the cuvette 100. In with such a configuration, the magnetic particles can be captured at the lower position of the cuvette 100 in the pre-magnetism collecting part 40 in advance before transferring the cuvette 100 to the BF ports 51 a to 51 d by the configuration described above, and hence the degree of freedom of the device configuration of the primary BF separator 11 can be further enhanced.

The embodiment disclosed herein is merely illustrative in all aspects and should not be recognized as being restrictive. The scope of the invention is defined by the appended Claims rather than by the description of the embodiments, and all changes that fall within meets and bounds of the claims, or equivalence of such meets and bounds are therefore intended to be embraced by the claims.

For instance, an example in which the analyzer of the present invention is applied to the immune analyzer 1 has been described in the embodiment described above, but the present invention is not limited thereto. The present invention can be applied as long as it is an analyzer that analyzes using a reagent containing magnetic particles, and can be applied even to an analyzer other than the immune analyzer. For instance, the present invention may be applied to an apparatus for extracting a specific DNA using the BF separation process.

An example in which one pre-magnetism collecting part is arranged has been described in the embodiment described above, but the present invention is not limited thereto. In the present invention, a plurality of pre-magnetism collecting parts may be arranged.

An example in which the pre-magnetism collecting part is arranged in the primary BF separator (secondary BF separator) has been described in the above embodiment, but the present invention is not limited thereto. The present invention may adopt a configuration in which the pre-magnetism collecting part is arranged separate from the primary (secondary) BF separator, and the cuvette in which the magnetism collecting process is carried out in advance in the pre-magnetism collecting part is transferred to the primary (secondary) BF separator.

Furthermore, an example in which two permanent magnets 42 a and 42 b are arranged in the pre-magnetism collecting part has been described in the above embodiment, but the present invention is not limited thereto. In the present invention, the number of permanent magnets may be one or three or more.

An example in which the permanent magnets 42 a and 42 b are arranged at positions immediately below the cuvette set in the cuvette installing portion has been described in the above embodiment, but the present invention is not limited thereto. The permanent magnets may be arranged at positions shifted from immediately below the cuvette to collect the magnetic particles to the bottom of the cuvette in the pre-magnetism collecting part. The permanent magnet and the cuvette may not overlap in plan view. Therefore, the permanent magnets may be arranged to collect the magnetic particles from the diagonally lower side of the cuvette set in the cuvette installing portion. The magnets are preferably arranged at positions immediately below the cuvette set in the cuvette installing portion to suppress the difference from creating in the performance of the BF separation process among the BF ports.

An example in which the permanent magnet serving as a magnetic force generating member is arranged in the pre-magnetism collecting part and each BF port has been described in the above embodiment, but the present invention is not limited thereto. In the present invention, an electromagnet and the like other than the permanent magnet may be used as long as it is a magnetic force generating member capable of magnetically capturing the magnetic particles in the cuvette.

An example in which a plurality of (four) BF ports is arranged has been described in the above embodiment, but the present invention is not limited thereto. In the present invention, one to three, or five or more BF ports may be arranged.

An example in which the permanent magnets 54 a and 54 b are arranged on the near side (arrow Y1 direction side) at the side of the cuvette set in the BF port has been described in the above embodiment, but the present invention is not limited thereto. In the present invention, the permanent magnets may be arranged on the lower side of the cuvette set in the BF port. The permanent magnets may be arranged on the far side of the cuvette set in the BF port, or the permanent magnets may be arranged so as to surround the side (periphery) of the cuvette.

An example in which a plurality of (four) nozzles and a plurality of (four) stirring catchers are arranged to correspond to each of the plurality of (four) BF ports has been described in the above embodiment, but the present invention is not limited thereto. In the present invention, a nozzle and a stirring catcher common to the plurality of BF ports may be arranged.

An example in which the cuvette is transferred to each BF port by one transfer arm arranged in the primary (secondary) BF separator has been described in the above embodiment, but the present invention is not limited thereto. In the present invention, a plurality of transfer arms may be arranged. The transfer arm may be arranged separate from the primary (secondary) BF separator. For instance, the transfer arm common to the primary BF separator and the secondary BF separator may be arranged separate from the primary (secondary) BF separator.

An example in which the cuvette set in the cuvette installing portion is taken out by the catcher of the transfer arm and transferred to each BF port has been described in the above embodiment, but the present invention is not limited thereto. For instance, the cuvette may be transferred from the cuvette installing portion to each BF port by a container transferring section such as a conveyor.

An example in which four BF ports, four nozzles, and four stirring catchers are respectively moved by one horizontal movement motor, one nozzle raising and lowering motor, and one stirring part raising and lowering motor has been described in the above embodiment, but the present invention is not limited thereto. In the present invention, a drive unit may be individually arranged in each BF port, nozzle, and stirring catcher so that they can move independent from each other. For instance, only the BF port may be individually moved. 

What is claimed is:
 1. An analyzing method for analyzing a target substance contained in a sample using magnetic particles, the method comprising steps of: (a) contacting a target substance with a reagent in a container, wherein a part of the reagent reacts with a complex of the target substance and magnetic particles, and another part of the reagent remains unreacted; (b) magnetically capturing magnetic particles in a mixture of the target substance and the reagent in the container with a first magnetic force generating member arranged below the container; (c) transferring the container of the mixture, including the unreacted part of the reagent, that has been exposed to the magnetic force generated by the first magnetic force generating member arranged below the container to a target substance separating section after the step (a), wherein the target substance separating section comprises a nozzle, a plurality of second holders configured to hold the container and a second magnetic force generating member that is arranged lateral to the container held by the second holder and is configured to expose the mixture in the container to a magnetic force; and (d) in the target substance separating section, lowering the nozzle to the container and aspirating the unreacted part of the reagent in the container by using the nozzle while magnetically capturing the magnetic particles in the container.
 2. The analyzing method according to claim 1, wherein the container has an inner side surface formed to a circular shape in a horizontal cross-section, so that, in the step (b), the magnetic particles are captured onto a bottom inner surface of the container, and in the step (d), the magnetic particles are captured onto the circular inner side surface of the container.
 3. The analyzing method according to claim 1, wherein in the step (c), the container is transferred to the target substance separating section in a state a magnetic force is not applied on the container.
 4. The analyzing method according to claim 1, wherein the first magnetic force generating member is arranged at a position that overlaps the container in plan view.
 5. The analyzing method according to claim 1, wherein the target substance separating section comprises a plurality of nozzles corresponding to the plurality of the second holders.
 6. The analyzing method according to claim 1, wherein the plurality of the second holders is arranged on a predetermined circumference.
 7. The analyzing method according to claim 1, wherein when the container is transferred to the target substance separating section, a magnetic force is not applied to the container.
 8. The analyzing method according to claim 1, wherein each of the first magnetic force generating member and the second magnetic force generating member is a magnet.
 9. The analyzing method according to claim 1, wherein the target substance is an antigen or an antibody.
 10. The analyzing method according to claim 1, wherein the container is transferred using a transfer arm.
 11. The analyzing method according to claim 1, wherein the first magnetic force generating member comprises a first magnet and a second magnet.
 12. The analyzing method according to claim 11, wherein the first and second magnets are arranged next to each other horizontally.
 13. The analyzing method according to claim 12, wherein the first and second magnets are installed such that an upper surface side of the first magnet becomes an N pole and an upper surface side of the second magnet becomes an S pole.
 14. The analyzing method according to claim 13, wherein an intermediate position between the first and second magnets is arranged immediately below the container. 